Improvement in combined pressure and vacuum valves



JOHN PORTEOUS.

Improvement in CombinedPressure and Vacuum Valves.

N ..115,982. Patented'June13,1871.

Fig.1.

5 1 "Hull!!!" Aid: a 2 1; 472:; 5

UNITED STATES JOHN PORTEOUS, OF-OINOINNATI, OHIO.

IMPROVEMENT IN COMBINED PRESSURE AND VACUUM VALVES Specification formingpart of Letters Patent No.7115,982, dated June 13, 1871.

I, J onN PoR'rEoUs, of Cincinnati, Hamilton county, State of- Ohio, haveinvented a new and useful Pressure and Vacuum Cock or Safety-Valve, ofwhich the following is a specification:

Nature and Objeetsof the Invention.

The subject of this invention is a safety device or appendage forsteam-generators, and especially for the form of them known askitchen-boilers; and comprises an outlet-valve which is held to its seatby a spiral spring, ad-

General Description with Reference to the Drawing.

- Figure 1 is an axial section of a safety valve embodying my invention.Fig. 2 is a trans- 7 verse section at the line X X.

A is a hollow plug or barrel, adapted to be screwed into the vessel orgenerator at its screw-threaded portion'a. A suitable distance from itspoint of insertion the barrel A is enlarged interior-1y to form a seat,B, and chamber O, for an outlet or pressure valve, D, which valve isconfined to its seat with any desired force by means of a spiral spring,E, whose stress is increased or diminished by the screwing inward oroutward of a tubularfollower, F, confined by a cap, G, which screws ontothe outside of the barrel. A ring or gland, H, and the cap Gr constitutea stuffing-box. A.

nozzle, I, which opens from the side of the barrel, permits the escapeof steam or water, as the case may be. Wings J serve to guide the valveD to an atrial path in opening and closing. The valve D is hollow, andterminates below in a flaring opening to form a seat for an inlet orvacuum valve, K, that is held to its closed position by a small spring,L, that bears against the interior extremity of the valve D at one end,and at the other end bears against a nut or follower, M, that is screweddown upon the valve-stem 70 until the desired stress of spring isobtained. Orifices d in the side of the valvestem d permit the freepassage of air to the interior of said stem.

Claim.

I claim herein as new and of my inventionf

